1. Wp Last Modified Info

2. Last Modified Timestamp

Adds the last modified time to the admin interface as well as a [last-modified] shortcode to use on the front-end.

3. Show Modified Date In Admin Lists

Show modified date column in the lists of pages and posts in the WordPress admin panel.

4. Post Updated Date

Use Posts Modified Date Plugin to Add "Last Updated Date" in WordPress.

5. Wp Last Modified

Show Last Modified date in your WordPress Posts and Pages.

6. Change Last Modified Date

Change or prevent updating Last Modified date for individual posts.

7. Limit Modified Date

Prevent the "modified date" from changing when making minor changes to your content.

8. If Modified Since

Comply with Webmaster Guidelines, save some bandwith and reduce server load with the If-Modified-Since header.

9. Wp Open Last Modified

This plugins adds the last modified date, current revision and the publication date of your post/page. Simply use the shortcode [last_modified_date]

10. Sort By Modified

Plugin adds a sortable modified date column to posts & pages within wordpress.